Strong Match — 88% match
based on chemical composition and mechanical property overlap.
JIS G4304 SUS420J1 (JIS G4304:2021) and BS 970 (Part 1) 420S29 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Stainless Steel category.
JIS G4304 SUS420J1 is typically used for hot-rolled stainless steel plates and strips, while BS 970 (Part 1) 420S29 is commonly used for stainless and heat resisting steel for mechanical and allied engineering purposes (table 13)..
JIS G4304 SUS420J1 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 420S29 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, JIS G4304 SUS420J1 vs BS 970 (Part 1) 420S29 is a 88% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a strong match overall at 88%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
JIS G4304 SUS420J1
BS 970 (Part 1) 420S29
Tensile Strength
>=520 MPa
Not specified
Yield Strength
>=225 MPa
Not specified
Elongation
>=18%
Not specified
Hardness
<=223 HB
Not specified
Condition
Annealed plate and strip; proof strength applies only when specified by the purchaser
Not specified
Typical Applications
JIS G4304 SUS420J1
Hot-rolled stainless steel plates and strips
BS 970 (Part 1) 420S29
Stainless and heat resisting steel for mechanical and allied engineering purposes (Table 13).
Can JIS G4304 SUS420J1 Be Substituted With BS 970 (Part 1) 420S29?
JIS G4304 SUS420J1 and BS 970 (Part 1) 420S29 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 420S29 is often considered as a substitute for JIS G4304 SUS420J1 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between JIS G4304 SUS420J1 and BS 970 (Part 1) 420S29?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4304 SUS420J1 be substituted with BS 970 (Part 1) 420S29?
JIS G4304 SUS420J1 and BS 970 (Part 1) 420S29 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 420S29 is often considered as a substitute for JIS G4304 SUS420J1 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.